The Collaborative International Dictionary
Demephitizing
Demephitize \De*meph"i*tize\, v. t. [imp. & p. p. Demephitized; p. pr. & vb. n. Demephitizing.] [Cf. F. m['e]phitiser to infect with mephitis.] To purify from mephitic or foul air. -- De*meph`i*ti*za"tion, n.
Wiktionary
demephitizing
vb. (present participle of demephitize English)